Sputtering

i have a 2010 ford fusion, had it for a few years now and recently it’s started sputtering when i put gas in, it’ll start but it seems like it’s having difficulty catching only happens when i put gas in, otherwise it starts fine, she’s getting up there in miles (293,000) but hoping to keep her running for a while still anyone else experience this?
i’m taking it in friday to get it looked at so i’d like an idea of what to expect them to say/how much i may be dishing out for this